Equipment is pretty much standard, as well as procedures. But treatment planning is also important, choice of dose depending on the size location etc., so that's where the human factor and experience count. This may be more important in complicated cases (larger tumors, proximity to brain stem, etc). I think that the procedures/dosages are pretty standard for smaller tumors. In some centres planning/dose is done by a radiation oncologist, in collaboration with a neurosurgeon, so you get the benefit of the combined experience of both.
There is a lot of good input in this thread, one thing that I wanted to add is post treatment follow-up, which is very important, especially post radiation, where you need follow up MRIs etc. This may be a bit problematic if you seek treatment further away, or not at all, depending on the facility/doctor. I know that some people have found it frustrating when problems cropped up and they couldn't get in touch with their doctors who did the treatment. So you should have a good understanding with your treatment team about who is responsible for the follow up, including assistance in case of problems (for example if a course of steroids is needed).
Marianna